fuchsia: Add branch to GetPlatformString() in variations_service.cc

Bug: 808287
Change-Id: I0124f24e96f54cc9ef7a96c7eeb788142da63ecc
Reviewed-on: https://chromium-review.googlesource.com/c/1298343
Reviewed-by: Jesse Doherty <jwd@chromium.org>
Commit-Queue: Scott Graham <scottmg@chromium.org>
Cr-Commit-Position: refs/heads/master@{#602748}
diff --git a/components/variations/service/variations_service.cc b/components/variations/service/variations_service.cc
index c1a8c4d..e33734c 100644
--- a/components/variations/service/variations_service.cc
+++ b/components/variations/service/variations_service.cc
@@ -105,6 +105,8 @@
   return "chromeos";
 #elif defined(OS_ANDROID)
   return "android";
+#elif defined(OS_FUCHSIA)
+  return "fuchsia";
 #elif defined(OS_LINUX) || defined(OS_BSD) || defined(OS_SOLARIS)
   // Default BSD and SOLARIS to Linux to not break those builds, although these
   // platforms are not officially supported by Chrome.